Terms And Definitions - Omron sysmac EtherNet/IP NJ Series Connection Manual

2. Terms and Definitions

Term
node
tag
tag set
tag data links
connection
connection type
originator and target
tag data link
parameters
Explanation and Definition
It refers to a relay point, a junction point or an end point on an
EtherNet/IP network made up of devices having an EtherNet/IP port.
A device with one EtherNet/IP port is recognized as one node and two
EtherNet/IP ports as two nodes on an EtherNet/IP network.
A unit that is used to exchange data with tag data links.
Data is exchanged between the local network variables and remote
network variables specified in the tags or between specified I/O memory
areas.
When a connection is established, from 1 to 8 tags (including Controller
status) is configured as a tag set. Each tag set represents the data that
is linked for a tag data link connection. Tag data links are therefore
created through a connection between one tag set and another tag set.
A tag set name has to be set for each tag set.
The standard EtherNet/IP implicit communications are called tag data
links. Tag data links enable cyclic tag data exchanges on an
EtherNet/IP network between Controllers or between Controllers and
other devices.
It is used to exchange data as a unit within which data concurrency is
maintained.
There are two kinds of connection types for tag data links.
One is a multi-cast connection, and the other is a unicast (point-to-point)
connection. The multi-cast connection sends an output tag set in one
packet to more than one node. The unicast connection separately sends
one output tag set to each node. Therefore, the multi-cast connection
can reduce the communications load if one output tag set is sent to
more than one node.
To make tag data links, it is necessary to establish connections between
nodes that perform tag data links. The node that requests the
connection is called the originator, and the node that receives the
request is called the target.
The information that is set to make tag data links, including tags, tag
sets and connections, is called tag data link parameters.
2．Terms and Definitions
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